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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="core.noncopyable"></a><a class="link" href="noncopyable.html" title="noncopyable">noncopyable</a>
</h2></div></div></div>
<div class="toc"><dl class="toc"><dt><span class="section"><a href="noncopyable.html#core.noncopyable.header_boost_core_noncopyable_hp">Header
      &lt;boost/core/noncopyable.hpp&gt;</a></span></dt></dl></div>
<div class="simplesect">
<div class="titlepage"><div><div><h3 class="title">
<a name="idm9290"></a>Authors</h3></div></div></div>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
          Dave Abrahams
        </li></ul></div>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="core.noncopyable.header_boost_core_noncopyable_hp"></a><a class="link" href="noncopyable.html#core.noncopyable.header_boost_core_noncopyable_hp" title="Header &lt;boost/core/noncopyable.hpp&gt;">Header
      &lt;boost/core/noncopyable.hpp&gt;</a>
</h3></div></div></div>
<p>
        The header <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">core</span><span class="special">/</span><span class="identifier">noncopyable</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
        defines the class <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">noncopyable</span></code>. It is intended to be used
        as a private base class. <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">noncopyable</span></code>
        has private (under C++03) or deleted (under C++11) copy constructor and a
        copy assignment operator and can't be copied or assigned; a class that derives
        from it inherits these properties.
      </p>
<p>
        <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">noncopyable</span></code> was originally contributed
        by Dave Abrahams.
      </p>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="core.noncopyable.header_boost_core_noncopyable_hp.synopsis"></a><a class="link" href="noncopyable.html#core.noncopyable.header_boost_core_noncopyable_hp.synopsis" title="Synopsis">Synopsis</a>
</h4></div></div></div>
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span>
<span class="special">{</span>
    <span class="keyword">class</span> <span class="identifier">noncopyable</span><span class="special">;</span>
<span class="special">}</span>
</pre>
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<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="core.noncopyable.header_boost_core_noncopyable_hp.example"></a><a class="link" href="noncopyable.html#core.noncopyable.header_boost_core_noncopyable_hp.example" title="Example">Example</a>
</h4></div></div></div>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">core</span><span class="special">/</span><span class="identifier">noncopyable</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>

<span class="keyword">class</span> <span class="identifier">X</span><span class="special">:</span> <span class="keyword">private</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">noncopyable</span>
<span class="special">{</span>
<span class="special">};</span>
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="core.noncopyable.header_boost_core_noncopyable_hp.rationale"></a><a class="link" href="noncopyable.html#core.noncopyable.header_boost_core_noncopyable_hp.rationale" title="Rationale">Rationale</a>
</h4></div></div></div>
<p>
          Class noncopyable has protected constructor and destructor members to emphasize
          that it is to be used only as a base class. Dave Abrahams notes concern
          about the effect on compiler optimization of adding (even trivial inline)
          destructor declarations. He says:
        </p>
<p>
          <span class="quote">“<span class="quote">Probably this concern is misplaced, because <code class="computeroutput"><span class="identifier">noncopyable</span></code>
          will be used mostly for classes which own resources and thus have non-trivial
          destruction semantics.</span>”</span>
        </p>
<p>
          With C++2011, using an optimized and trivial constructor and similar destructor
          can be enforced by declaring both and marking them <code class="computeroutput"><span class="keyword">default</span></code>.
          This is done in the current implementation.
        </p>
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<td align="right"><div class="copyright-footer">Copyright © 2014 Peter Dimov<br>Copyright © 2014 Glen Fernandes<br>Copyright © 2014 Andrey Semashev<p>
        Distributed under the <a href="http://boost.org/LICENSE_1_0.txt" target="_top">Boost
        Software License, Version 1.0</a>.
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